EP2936086A1 - Cabine de balances à compensation d'inclinaison - Google Patents

Cabine de balances à compensation d'inclinaison

Info

Publication number
EP2936086A1
EP2936086A1 EP13799587.4A EP13799587A EP2936086A1 EP 2936086 A1 EP2936086 A1 EP 2936086A1 EP 13799587 A EP13799587 A EP 13799587A EP 2936086 A1 EP2936086 A1 EP 2936086A1
Authority
EP
European Patent Office
Prior art keywords
determining means
deformation body
load cell
longitudinal axis
central longitudinal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP13799587.4A
Other languages
German (de)
English (en)
Other versions
EP2936086B1 (fr
Inventor
Volker Ziebart
Klaus Peter Selig
Urs Loher
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mettler Toledo Schweiz GmbH
Original Assignee
Mettler Toledo AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mettler Toledo AG filed Critical Mettler Toledo AG
Priority to EP13799587.4A priority Critical patent/EP2936086B1/fr
Priority to PL13799587T priority patent/PL2936086T3/pl
Publication of EP2936086A1 publication Critical patent/EP2936086A1/fr
Application granted granted Critical
Publication of EP2936086B1 publication Critical patent/EP2936086B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G3/00—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances
    • G01G3/12—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing
    • G01G3/14—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing measuring variations of electrical resistance
    • G01G3/1414—Arrangements for correcting or for compensating for unwanted effects
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G23/00—Auxiliary devices for weighing apparatus
    • G01G23/002—Means for correcting for obliquity of mounting
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G3/00—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances
    • G01G3/12—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing
    • G01G3/14—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing measuring variations of electrical resistance
    • G01G3/1402—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports
    • G01G3/1408—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports the supports being of the column type, e.g. cylindric
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
    • G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
    • G01L1/2206—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports
    • G01L1/2218—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports the supports being of the column type, e.g. cylindric, adapted for measuring a force along a single direction
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
    • G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
    • G01L1/2268—Arrangements for correcting or for compensating unwanted effects
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/26—Auxiliary measures taken, or devices used, in connection with the measurement of force, e.g. for preventing influence of transverse components of force, for preventing overload

Definitions

  • the invention relates to a load cell, in particular a stamp load cell, with a deformation body, with a corresponding to the output of a load
  • Measuring signal certain first determining means, which is attached to the outer surface of the deformation body, and a second determination means for determining a compensation position corresponding to the compensation value determined.
  • Weighing cells are used to monitor filling levels in tanks, loading buckets on lorries and in weighing systems for vehicles. Most of the total load is distributed over a supporting structure, for example a balance bridge, on several stamp load cells.
  • Stamp load cells are approximately cylindrical load cells, which are loaded in the direction of their rotational symmetry axis between two force introduction elements. For the introduction of force, the cylindrical load cells have a
  • Deformation body with cylinder end faces which are designed for this purpose convex, usually with a radius that is greater than half the height of the cell.
  • a load cell is self-righting, i. at
  • Oblique position act restoring forces, which try to put the cell back in a vertical position. If several load cells, for example, in a balance bridge, arranged together, then the individual load cells are mechanically no longer completely free, as they are coupled together and thus influence each other. The individual restoring forces of the load cells act on the arrangement as a whole, which results in a minimization of the mechanical energy of the overall system. However, the individual load cells may be skewed.
  • a stamp load cell measures the weight force acting on it correctly only if the entire arrangement consisting of the deformation body and the upper and lower force introduction element fulfills two conditions.
  • the deformation body and the two planar force introduction elements must be aligned along a common axis, ie the two force introduction elements are parallel to each other and the longitudinal axis of the deformation body is parallel to the surface normal of the force introduction elements.
  • a second condition must be the direction of gravity with the common axis of the arrangement
  • the weight force is determined, which corresponds to the mass of the applied product.
  • the weight force is always bound to the direction of gravity g, and depends on the locally effective severity at the site.
  • the first condition can also be described such that the connecting line between the two current contact points of the deformation body and the force introduction elements with the longitudinal axis of the deformation body
  • Longitudinal axis of the deformation body can be described, however, has four degrees of freedom. These degrees of freedom correspond to four transformations to bring the connection line with the longitudinal axis of the deformation body in coincidence.
  • degrees of freedom correspond to four transformations to bring the connection line with the longitudinal axis of the deformation body in coincidence.
  • two rotations are required, in each case mutually orthogonal directions, after which the connecting line is parallel to the longitudinal axis and then lateral displacements in two mutually orthogonal directions
  • a load cell comprising a deformation body and two
  • the force introduction element may deviate from the ideal alignment after installation and operation of the load cell.
  • the deviation has a total of 6 degrees of freedom, because each force introduction element and the deformation body can each be inclined in two mutually orthogonal directions by an angle.
  • the same number of degrees of freedom results when the degrees of freedom for the deviation from the ideal arrangement, namely four, are added to the degrees of freedom for the deviation of the common axis of the ideal arrangement from the ideal orientation, namely two angular degrees of freedom.
  • a malposition of the load cell is basically the deviation of this from the ideal alignment. Deviating from the ideal alignment can on the one hand
  • Deformation body itself be tilted, i. the central axis of the
  • Deformation body is not parallel to the direction of gravity, however, remain the load cells facing sides of the force application elements perpendicular to the direction of gravity.
  • the force introduction elements can be tilted, i. not aligned parallel to each other. Nevertheless, the central longitudinal axis of the deformation body can run parallel to the direction of gravity. The overall complexity of the misalignment increases when both
  • Deviations from the ideal orientation, ie skew of the deformation body and tilting of the force introduction elements occur at the same time. From considerations of technical mechanics, the overall system has six degrees of freedom.
  • a malposition can be caused by various causes. Assuming that a load cell has been installed in the ideal orientation, an inclination of the deformation body, for example, caused by a thermal expansion of the balance bridge and tilting of the
  • the misalignment of a load cell results in a measurement error, in particular the geometry of the load cell itself, ie their height, the radii at the two Ends and the diameter depends.
  • the measurement error is generally quite large and can be several thousand ppm (parts per million) of the measurement signal at full load.
  • the measurement errors resulting from misalignment can be subdivided into two error types.
  • stamping cells including the
  • Determining means rotationally symmetrical under 90 ° turns of the load cell about its central axis.
  • the first type of error is caused by a deviation from this rotational symmetry.
  • the measurement error of the first error type is therefore an antisymmetric function of the tilt and / or skew angle, i. one
  • the measurement error is essentially a linear function of the tilt angle.
  • This measurement error is often referred to as corner load error and can be made to disappear either by restoring rotational symmetry or by a grinding operation on the load cell.
  • the second type of error also exists with complete rotational symmetry and is given by the geometry of the load cell. This measurement error is due to the
  • geometric symmetry is a symmetric function of the tilt and / or skew angle, i. the measurement error is independent of the sign of the tilt or skew angle.
  • a stamp load cell with determining means is known, for example, from JP 4 408 518 B2. This load cell measures the load force by means of strain gauges (DMS), which are mounted on the deformation body in the longitudinal direction to the central axis. The same load cell has to determine the inclination of the
  • Deformation body a tilt sensor, which is able to determine the deflection angle to the vertical.
  • the inclination is determined by means of contact surfaces and a dielectric liquid enclosed in a ring.
  • the disadvantage is the use of the separate, costly inclination sensor in addition to the strain gauges attached to the deformation body. It is equally disadvantageous that the disclosed load cell can not make a distinction between the different misalignments. Is the central longitudinal axis of the deformation body aligned in the direction of gravity so is a possible malposition of the
  • JP 2010 133 785 A discloses a load cell similar to the above-mentioned device.
  • the load cell described here measures the load force by means of two pairs of strain gages each having one strain gauge in the longitudinal and one transverse direction to the central longitudinal axis.
  • the same load cell also has an inclination sensor for determining the inclination of the deformation body, similar to the device described above, which by improvement is capable of determining not only the deflection angle to the perpendicular but also its inclination
  • Inclinometer is needed in addition to the strain gauges. However, the detected signals from the strain gauges and the sensor are not sufficient for one
  • EP 1 486 762 A2 discloses a stamp load cell with means for
  • strain gauges can be different
  • Deformation body is not completely symmetrical. In a bridge circuit are uneven signals in the. With additional balancing resistors
  • Bridge circuit arms compensated. This method only compensates for the linear measurement error caused by a deviation from rotational symmetry.
  • JP 2007 033 127 A discloses a columnar loading element, for example for a truck scale bridge. Similar to the device disclosed in JP 2010 133 785 A, it also has a plurality of strain gauges to measure, in addition to the deformation caused by the load, also deformations caused by misalignment. Unlike in the device of JP 2010 133 785 A, however, the misalignment is also determined by means of strain gauges. Two strain gauges lying opposite one another on the lateral surface of the deformation body each form a pair and are differently compressed or stretched in the case of a deformity deformation. In a difference circuit of the two
  • a bending stress can be determined. With two additional pairs of strain gauges rotated by 90 ° about the central longitudinal axis as an axis of rotation, two degrees of freedom of misalignment can be calculated. From three Wheatstone bridge circuits, one for load deformation, and one each for deformity deformation in two mutually orthogonal directions, the measurement result is finally calculated.
  • strain gauges on the lateral surface of the deformation body Despite the high Number of strain gauges can be determined by this arrangement, and in combination with the strain gauges for load deformation, only two degrees of freedom, which is too little to see whether the deformation body is inclined and / or whether the force application elements are not parallel to each other.
  • JP 2010 210 357 it is mentioned that a strain gauge is attached in the direction of the zero voltage. This is used solely to achieve on-site temperature compensation by incorporating this load-independent resistor into a bridge circuit. The direction in which the strain gauge is applied, or the angle to the first
  • Main stress is derived from the material-dependent Poisson number. This invention does not include a solution to compensate for misalignment of the
  • a stamp load cell differs from a multiaxial load cell in that only one force component in one direction - namely in the direction of gravity g - is determined. Other forces and moments along other directions are not relevant to the actual task of the stamp load cell, namely to determine the weight.
  • the object of the invention is to provide a robust and more accurate load cell with defect compensation.
  • the misalignment is to be detected as completely as possible, that is to detect more than two degrees of freedom in the malposition, and to improve such a load cell with respect to a measured value drift.
  • Another object is to realize the defect compensation with simple means. But also the material and production costs of the load cell should be kept low.
  • the load cell has a deformation body with an upper and a lower contact surface.
  • the contact surfaces are designed for the introduction of force in the deformation body and each have a support point, wherein the current support points together a force reference line form.
  • a column-shaped region of the deformation body is arranged, which has a central longitudinal axis and a generating line parallel to this.
  • the load cell comprises a first
  • Deformation body is attached and the mechanical deformation of the
  • Deformation body converts into an electronic signal, and a second
  • the first determination means and the second determination means each have at least one
  • the at least one strain gauge sensor of the second determining means is substantially centered between the upper and lower ones
  • the conversion of the mechanical deformation into an electronic signal by the first determining means is carried out according to the size of the mechanical
  • Deformation of the deformation body i. the greater the mechanical deformation, the greater the electronic signal. Therefore, not only can a qualitative measurement be made from this electronic signal (presence of a mechanical deformation), but also a quantitative measurement (magnitude of the mechanical deformation) which reflects the extent of the mechanical deformation of the deformation body.
  • the conversion of the deviation of the central longitudinal axis to the force reference line in an electronic signal is determined by the second determining means according to the size of this deviation. With the second determining means, it is thus also possible to make a quantitative measurement and thus not only detect the deviation of the central longitudinal axis from the force reference line, but also to determine its size.
  • Determining means lies in the type of information of the electrical signal. More specifically, the first determination means provides the main information, namely Deformation of the deformation body along the central longitudinal axis. With the second determination means, information regarding a misalignment, ie additional information, is determined.
  • the ideal arrangement of the load cell is defined geometrically as the coincidence of the direction of the force introduced with the central longitudinal axis of the deformation body, that is, the force reference line and the central longitudinal axis are superimposed. There is no bending or shearing stress on the columnar region of the deformation body and the measurement signal can be used without compensation for the measurement result.
  • Mantelline aligned strain gauge is highly sensitive for detecting the inclination of the load cell. Another advantage is the buoyancy of the
  • strain sensors usually resistive strain gauges are used in metal foil technology. Also, strain gauges in thin-film technology and in thick-film technology are known. Furthermore, strain gauges may be based on optical principles and / or surface acoustic waves
  • Deformation body in particular of the Poisson number of the material depends.
  • the predefined, acute angle in the range of 54 - 72 °, depending on the material used of the columnar
  • the predefined acute angle is 61.3 °.
  • a development of the invention provides that the first determining means and the second determining means are attached to the lateral surface of the columnar region, substantially centrally between the contact surfaces.
  • the first determination means can also be arranged on the same generatrix above or below the second determination means, but advantageously as centrally as possible between the contact surfaces.
  • Base carrier sheet can be applied, placed in the production together in a single operation and aligned, and so time and cost can be saved.
  • a further embodiment of the invention provides that the first determination means and / or the second determination means each have at least two strain gauges located opposite each other with respect to the central longitudinal axis or
  • Strain gauge sensors are used for signal evaluation in a Wheatstone
  • Bridge circuit arranged so that these the result of the signal evaluation with respect to the mechanical deformation of the deformation body in the direction of the central longitudinal axis and / or the result of the signal evaluation with respect to a
  • An advantageous embodiment of the invention provides that two Dehnmesssensoren or Dehnmesssensorfare the first determining means and / or two Dehnmesssensoren the second determining means by an angle, in particular an angle of 90 °, about the central longitudinal axis rotated as a rotation axis, each on the lateral surface, are arranged.
  • this arrangement allows an improved determination of the mechanical
  • a further advantageous embodiment of the invention provides that the at least two Dehnmesssensoren the second determining means in each case between the Dehnmesssensoren the first determining means, in particular centrally, and mutually rotated by 90 ° about the central longitudinal axis as a rotation axis, are arranged.
  • This embodiment allows the arrangement of all Dehnmesssensoren on the same circumference of the lateral surface.
  • Determining means two arranged in the predefined, acute angle
  • Center longitudinal axis are aligned and in pairs on the deformation of body are mounted opposite each other, wherein the arranged in the predefined acute angle Dehnmesssensoren and the two pairs of
  • Rotary axis are turned.
  • the columnar region of the deformation body has at least two along its central longitudinal axis
  • Diameter on in particular has a dumbbell-like shape.
  • the diameter in the region of the determining means is reduced. This increases the material stress in the cross section of the reduced diameter of the columnar region, and there is a greater deformation of the
  • the load cell has a
  • Type-specific or device-specific calibration In a type-specific calibration, the same parameter values are stored in memory
  • Waste cell processing unit provided that these load cells are of the same type or of the same model series.
  • the parameter values used are determined from the mean value of a few sample measurements and transferred to all other load cells. This reduces the effort in the
  • the device-specific calibration is performed when the load cell has to meet an increased accuracy standard.
  • the individual parameter values for each individual load cell are then determined.
  • a balance in particular a vehicle scale, tank scale or
  • the at least one weighing cell has a first determining means, which is the mechanical
  • Deformation of the deformation body converted into a signal, and a second
  • the Determining means which converts a deviation of the central axis to the force reference line into a corresponding signal.
  • the first determining means and the second determining means each comprise at least one Dehnmesssensoren, wherein the at least one of the Dehnmesssensoren is mounted substantially centrally between the upper contact surface and lower contact surface and thereby aligned by a predefined acute angle with respect to the surface line such that the signal of the second determining means in the absence of deviation of the center line to the force reference line is zero, ie is load independent.
  • Load cell on a deformation body with an upper and a lower contact surface.
  • the contact surfaces are designed for the introduction of force into the deformation body and each have a support point, wherein the current
  • the weighing cell comprises a first determining means and a second determining means, wherein the first determining means and the second determining means are each at least have a strain gauge.
  • the method is characterized by the following steps, that at least one strain gauge sensor is the first
  • Determining means which is mounted on the lateral surface of the columnar portion of the deformation body, that the mechanical deformation of the deformation body is converted into a signal of the first determining means, is provided and at least one Dehnmesssensor second
  • Determining means which is so mounted on the lateral surface of the columnar portion of the deformation body, that a deviation of the central longitudinal axis to the force reference line is converted into a signal of the second determining means is provided, wherein the at least one of the Dehnmesssensoren in
  • Generating line is aligned such that the signal of the second determining means is zero in the absence of deviation of the central longitudinal axis to the force reference line.
  • the signal of the at least one strain gauge sensor of the first determination means is determined, and subsequently or at the same time the signal of the at least one strain measuring sensor of the second determination means aligned by the predefined, acute angle with respect to the surface line is determined. This is followed by a determination of compensation values with respect to a malposition of the
  • the weighing result is calculated from the signal of the first determining means, the second determining means and the compensation values.
  • the determination of the compensation values is carried out by a distinction between parallel shifted force introduction elements, tilted force introduction elements, and parallel shifted and tilted
  • the signals of Dehnmesssensoren the first determining means and / or the second determining means in a Processing unit can be determined individually and / or in pairs.
  • the processing unit of the weighing cell can thus be provided with the maximum information content from the signals of the strain measuring sensors in order to make the best possible compensation of a malposition.
  • Processing unit temporally serial. For example, in at least one
  • Bridge circuit Thus, the number of bridge circuits in a load cell can be kept low.
  • the signals are thereby individually and temporally connected in series to the at least one bridge circuit by means of an additional circuit.
  • Fig. 1 is a front view of the load cell in ideal alignment with the first
  • Fig. 2 is a front view of the load cell in an ideal arrangement with the first
  • Fig. 3 is a sectional view of the load cell of Fig. 1 at the point A-A with the first
  • Fig. 4 is a plan view of the load cell of Fig. 3 in the direction B with the first
  • Fig. 5 is a front view of the load cell in ideal alignment with the first
  • Fig. 6 is a sectional view of the load cell of Fig. 5 at the point C-C with the first
  • Fig. 7 is a front view of the inclined load cell of Fig. 1 with the first
  • Fig. 8 is a front view of the load cell of Figure 1 with the first determining means and with an obliquely mounted second determining means with tilted upper force introduction element.
  • FIG. 9 is a front view of the load cell of Figure 1 with first determining means and with an inclined second determining means with two tilted force introduction elements ..;
  • Fig. 10 is a front view of the load cell with first determining means and with an inclined second determining means in a tilted
  • Fig. 1 an arrangement of several load cells on a balance bridge
  • Fig. 12 is a side cross-section through a vehicle scale.
  • FIG. 1 shows in elevation a load cell 1 with a deformation body 2 between two force introduction elements 1 1 in the ideal orientation.
  • the deformation body 2 and the force introduction elements 1 1 touch each other at a support point 5, since the upper contact surface 3 and the lower contact surface 4 of a spherical surface
  • Support points 5 is defined act. The best weighing results deliver one
  • columnar portion 7 of the deformation body 2 is directed in the direction of gravity G and the surface normals of the deformation body 2 facing sides 12 of the force introduction elements 1 1 are parallel thereto, or in other words the force reference line 6 and the central longitudinal axis 8 of the columnar portion 7 of the deformation body 2 are congruent and in the direction of gravity G are aligned.
  • the columnar area 7 of the deformation body 2 along the central longitudinal axis 8 has at least two diameters.
  • the columnar region 7 of the deformation body 2 has in particular one
  • dumbbellish shape A load cell 1 of a certain size can be adapted specifically to the weighing project or to the weighing range of the customer.
  • Deformation body 2 along the central longitudinal axis 8 compressed (compressed) and radially to the central longitudinal axis 8 stretched (expanded). Due to the deformation occurs in the deformation body 2 along the central longitudinal axis 8 (first main direction) the
  • the elongation 82 occurring due to this so-called transverse contraction is defined as transverse strain.
  • the Poisson number ⁇ a material constant, describes how the elongation ⁇ behaves to the elongation ⁇ .
  • ⁇ is the angle between the zero-strain direction and the first one
  • the strain measuring sensors of the first determining means 9 are on the lateral surface of the columnar portion 7 of the deformation body 2 along the same
  • the first determining means 9 shown in Figure 1 is a total of eight
  • Arranging location are two Dehnmesssensoren present, which convert either either either a deformation in the direction of the central longitudinal axis 8 (first main direction) or 90 ° transverse to the central longitudinal axis 8 (second main direction) into signals.
  • a deformation measurement in 90 ° transverse to the direction of the central longitudinal axis 8 provides an additional signal to that signal which is measured in the direction of the central longitudinal axis 8.
  • the strain gauges experience the deformation of the Deformation body 2 a change in length and change their electrical
  • strain gauges which are decisive for their interconnects (also called meanders), these are in a certain - your assigned - direction sensitive to deformation due to change in length. Due to the change in electrical resistance, a processing unit (not shown here) can determine the force introduced, which in turn makes it possible to conclude on the mass of the weighing sample.
  • the deformation of the deformation body 2 increases, in the case of the metallic material of the deformation body 2, correspondingly linearly
  • the conversion of the deformation into an electronic signal by the first determining means 9 thus takes place in accordance with the size of the deformation, and is thus a quantitative measurement
  • the second determining means 10 is also formed here by Dehnmesssensoren and in the middle, preferably centrally between the upper contact surface 3 and the lower contact surface 4, respectively.
  • the strain measuring sensors of the second determining means 10, here in FIG. 1 are two in number rotated by the predefined acute angle ⁇ (seen in FIG. 3) with respect to the central longitudinal axis 8 of the columnar portion 7 and correspondingly convert the mechanical deformation of the Deformation body 2 along the zero-elongation direction in a signal to. If the force reference line 6 coincides with the central longitudinal axis 8 of the columnar region 7 of the deformation body 2, as shown in FIG. 1, this is equivalent to the ideal arrangement of the weighing cell 1.
  • a strain measuring sensor of the second determining means 10 does not undergo change in length, since no strain or deformation occurs in the zero strain direction.
  • the signal of the second determining means 10 is therefore equal to zero at ideal orientation, i. independent of load.
  • the ideal orientation and the ideal arrangement of a weighing cell 1 differ in that the
  • FIG. 3 shows the arrangement of the first determining means 9 and of the second determining means 10 on the circumference of the columnar region 7 as a section through FIG. 1 at the point A-A.
  • Determining means 9 are each rotated by 90 ° about the central longitudinal axis 8 offset, so arranged in pairs diametrically opposite and can be switched in a wheatstone bridge circuit.
  • Dehnmesssensor the second determining means 10 is arranged angularly symmetrical between two Dehnmesssensoren the first determining means 9.
  • the signal of Dehnmesssensors corresponds to a malposition of the load cell 1 the proportion of misalignment in the plane E- ,
  • the misalignment of the weighing cell 1 in any spatial direction can be determined. If the strain measuring sensors of the second determining means 10 each have a further strain gauge sensor arranged diametrically opposite one another on the circumference, the electrical signals from the respectively opposite strain gauge sensors can be used for a better measurement signal in a Wheatstone
  • Bridge circuit can be used to determine a malposition in the corresponding plane, or used individually to determine the compensation more degrees of freedom.
  • Figure 4 is a view of the columnar region 7 from the viewing direction B, as shown in Figure 3.
  • FIG. 4 shows a section of the columnar region 7 of the deformation body 2. At the same circumference as the strain measurement sensors of the first determination means 9, at least one of them is located between them
  • the second determining means 10 is arranged.
  • the second Determining means 10 is rotated by the angle ⁇ to the central longitudinal axis 8 of the columnar portion 7. This angle is dependent on the material of the deformation body 2 and is here, in Figure 4, for the steel used for deformation body 2 61 .3 °.
  • Determining agent 10 is not mandatory. Also possible is an arrangement of the first determining means 9 above or below the substantially centrally located between the contact surfaces 3 and 4 Dehnmesssensoren the second determining means 10, as can be seen in Figure 5. Although they are
  • the first determining means 9 is no longer centrally located on the lateral surface of the columnar portion 7 of the deformation body 2, but the stress distribution is homogeneous enough here to obtain a usable signal.
  • An advantage of this arrangement is that the strain gauges of the first determining means 9 and the second determining means 10 can be applied to the same base sheet and aligned with each other to be placed together in one operation during manufacture. This reduces the time required and costs can be saved.
  • FIG. 6 shows a section through FIG. 5 at location C-C. On the same circumference in 90 ° increments about the central longitudinal axis 8 are rotated
  • FIG. 7 shows the arrangement of the weighing cell 1 from FIG. 1 with an inclined position of the
  • the first determination means 9 no longer measures exactly the applied weight, but is subject to errors.
  • the second determining means 10, which is rotated by the angle ⁇ , is no longer located in the same way
  • Zero-elongation direction in the absence of ideal alignment in an electronic signal by the second determining means 10 thus takes place according to the size of the deformation in the zero-elongation direction, and thus is a quantitative measurement.
  • the converted signal of the second determining means 10 is therefore according to the above embodiment a quantitative statement about the inclination of the weighing cell. 1
  • Force introduction element 1 1 tilts rests.
  • the upper support point 5 is shifted to the right whereby the force reference line 6 no longer coincides with the central longitudinal axis 8.
  • the signal of the first determining means 9 no longer corresponds exactly to the applied weight force of the load to be measured, but must be compensated because of the tilting of the upper force introduction element 1 1. This is done by the additional use of the signals from the at least one Dehnmesssensor the second determining means 10, which is now no longer aligned exactly to the zero-strain direction due to the tilting.
  • both force introduction elements 1 1 are tilted.
  • the central longitudinal axis 8 is parallel to the force reference line 6 but does not coincide with this, and it finds a
  • strain gauges may be added to complement the second sensing means 10.
  • four more strain sensors which are parallel to the Center longitudinal axis 8 are aligned and in pairs on the deformation body 2 are mounted opposite each other, in addition to the predefined acute angle Dehnmesssensoren mutually rotated by 90 ° about the central longitudinal axis 8 as a rotation axis to determine the malposition and the compensation values to calculate.
  • FIG. 10 shows a further malposition of the weighing cell 1, in which the
  • Force introduction elements 1 1 are tilted in addition to the inclination of the deformation body 2, that is, the deformation of the body 2 facing sides 12 of the force introduction elements 1 1 are no longer parallel to each other.
  • the force reference line 6 no longer intersects the central longitudinal axis 8 in the center of the deformation body 2, which makes it difficult to determine the compensation of the measurement signal.
  • the strain measuring sensors of the first determining means 9 and the strain measuring sensors of the second determining means 10 respectively convert into an electrical signal corresponding to the amount of deformation in the direction assigned to them. There is a continuous measurement of the state of deformation, wherein the size of the electrical signal depicts the extent of the deformation.
  • the electrical signal of the first determining means 9 is corrected with the signal of the second determining means 10.
  • the load cell 1 outputs a weight force F G applied in the direction of gravity g to the display (not shown).
  • FIG. 11 shows a balance, especially a vehicle scale.
  • the balance bridge 18 is a flat surface which serves to receive a load. It is supported by at least three load cells, here in Figure 1 1 by six pieces, which are arranged below the balance bridge 18 and thus do not hinder the application of the load.
  • the load cells 2 in turn are supported on the ground, which is designed so that the weighing platform can be loaded or driven without a significant paragraph.
  • This is, as shown in Figure 12, realized by a weighing pit 19, which is just so deep that the bearing surface of the weighing platform 18 forms a plane with the ground.
  • two load cells 1 are shown.
  • Two additional load cells (the balance bridge stands on at least four load cells 1) are obscured by the two preceding load cells 1 and therefore can not be seen by the viewer.
  • the balance bridge stands on at least four load cells 1
  • Embodiments combined with each other and / or individual functional units of the embodiments are exchanged.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Force In General (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)

Abstract

La cabine de balances (1) comporte un élément déformable (2) qui possède une surface de contact supérieure (3) et une surface de contact inférieure (4). Les surfaces de contact (3, 4) sont configurées pour appliquer une force à l'élément déformable (2) et, pour cela, elles possèdent chacune un point d'appui (5), les points d'appuis réels formant conjointement une ligne de référence de force (6). Entre les surfaces de contact (3, 4) est disposé une zone en forme de colonne (7) de l'élément déformable qui possède un axe médian longitudinal (8) et une ligne d'enveloppe parallèle à celui-ci. La cabine de balances (1) comprend en outre un premier moyen de détermination (9) qui est monté sur la zone en forme de colonne (7) de l'élément déformable (2) et qui convertit la déformation mécanique de l'élément déformable (2) en un signal, et un second moyen de détermination (10) qui est monté sur la zone en forme de colonne (7) de l'élément déformable (2) et qui convertit un écart de l'axe médian longitudinal (8) par rapport à la ligne de référence de force (6) en un signal correspondant. Le premier moyen de détermination (9) et le second moyen de détermination (10) comportent chacun au moins un capteur extensométrique. Le ou les capteurs extensométriques du second moyen de détermination (10) sont montés sensiblement au milieu entre la surface de contact supérieure (3) et la surface de contact inférieure (4) et orientés suivant un angle aigu prédéfini par rapport à la ligne d'enveloppe de telle façon que le signal du deuxième moyen de détermination (10) devient nul en l'absence d'écart de l'axe médian longitudinal (8) par rapport à la ligne de référence de force (6).
EP13799587.4A 2012-12-19 2013-12-05 Cellule de pesage avec compensation d'inclinaison Active EP2936086B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP13799587.4A EP2936086B1 (fr) 2012-12-19 2013-12-05 Cellule de pesage avec compensation d'inclinaison
PL13799587T PL2936086T3 (pl) 2012-12-19 2013-12-05 Ogniwo obciążnikowe z kompensacją przechylenia

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP12198128.6A EP2746735A1 (fr) 2012-12-19 2012-12-19 Cellule de pesage avec compensation d'inclinaison
EP13799587.4A EP2936086B1 (fr) 2012-12-19 2013-12-05 Cellule de pesage avec compensation d'inclinaison
PCT/EP2013/075682 WO2014095397A1 (fr) 2012-12-19 2013-12-05 Cabine de balances à compensation d'inclinaison

Publications (2)

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EP2936086A1 true EP2936086A1 (fr) 2015-10-28
EP2936086B1 EP2936086B1 (fr) 2021-03-03

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EP13799587.4A Active EP2936086B1 (fr) 2012-12-19 2013-12-05 Cellule de pesage avec compensation d'inclinaison

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EP (2) EP2746735A1 (fr)
CN (1) CN104884913B (fr)
AU (1) AU2013361804B2 (fr)
BR (1) BR112015013139A2 (fr)
CA (1) CA2893016C (fr)
MX (1) MX349764B (fr)
PL (1) PL2936086T3 (fr)
RU (1) RU2015129481A (fr)
WO (1) WO2014095397A1 (fr)

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EP2746735A1 (fr) * 2012-12-19 2014-06-25 Mettler-Toledo AG Cellule de pesage avec compensation d'inclinaison
WO2016159245A1 (fr) * 2015-03-31 2016-10-06 株式会社ＮｅｊｉＬａｗ Élément équipé d'une trajectoire de conduction, procédé de formation de motifs de trajectoire de conduction, et procédé permettant de mesurer des changements dans un élément
JP6561802B2 (ja) * 2015-11-27 2019-08-21 日本製鉄株式会社 動的荷重測定装置及び補正プログラム
CN105675097A (zh) * 2016-03-23 2016-06-15 无锡研测技术有限公司 一种冗余称重传感器
CN106768214A (zh) * 2016-11-29 2017-05-31 济南金钟电子衡器股份有限公司 一种自补偿柱式数字称重传感器及系统
US10024773B1 (en) * 2017-01-13 2018-07-17 The Boeing Company System and method for loading a test asset
CN111397789B (zh) * 2019-01-02 2023-12-29 鸿富锦精密电子(郑州)有限公司 扭力压力感测装置及电动起子
CN110220625B (zh) * 2019-05-30 2021-07-30 南开大学 一种谐波减速器柔轮输出力矩的测量方法
CN110487375B (zh) * 2019-07-29 2021-11-02 嘉兴博创智能传感科技有限公司 一种双重式称重传感器
CN111174886B (zh) * 2019-10-11 2021-06-29 宁波柯力传感科技股份有限公司 一种车载自稳定称重传感器
CN110954268B (zh) * 2019-12-20 2021-10-22 电子科技大学中山学院 一种偏载校准系统
CN110926584B (zh) * 2019-12-31 2020-08-28 山东山大新元易通信息科技有限公司 一种多传感器电子秤着地检测系统及方法
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CN113393525B (zh) * 2021-08-18 2021-12-10 深圳市安普测控科技有限公司 基于精准称重的重量校准方法

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Also Published As

Publication number Publication date
AU2013361804B2 (en) 2017-08-31
MX349764B (es) 2017-08-11
WO2014095397A1 (fr) 2014-06-26
EP2746735A1 (fr) 2014-06-25
MX2015007703A (es) 2015-09-07
CN104884913A (zh) 2015-09-02
CN104884913B (zh) 2019-01-08
US9605993B2 (en) 2017-03-28
CA2893016C (fr) 2019-07-16
RU2015129481A (ru) 2017-01-23
PL2936086T3 (pl) 2021-11-02
CA2893016A1 (fr) 2014-06-26
AU2013361804A1 (en) 2015-07-02
US20150308883A1 (en) 2015-10-29
BR112015013139A2 (pt) 2017-07-11
EP2936086B1 (fr) 2021-03-03

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